{
  "id": "linux-exit-codes-mcq",
  "title": "Reading Exit Code Conventions",
  "category": "Linux Fundamentals",
  "isolation_type": "shared_namespace",
  "difficulty": "Easy",
  "type": "mcq",
  "weight": 3,
  "description": "## Reading Exit Code Conventions\n\nYou run `grep pattern file.txt` and it exits with code `1`, printing no error message at all. What actually happened?",
  "options": [
    { "id": "a", "text": "The file doesn't exist" },
    { "id": "b", "text": "grep found no lines matching the pattern — this is grep's normal way of reporting \"no match,\" not an error" },
    { "id": "c", "text": "You don't have permission to read the file" },
    { "id": "d", "text": "The command is broken and needs to be reinstalled" }
  ],
  "correct_option": "b",
  "explanation": "grep's exit code means \"did I find at least one match,\" not \"did something go wrong.\" Exit 1 with no error message is grep's normal, expected way of reporting zero matches — a very common early surprise, since silence plus a non-zero code doesn't always mean a real failure occurred.",
  "hints": [],
  "setup_commands": [],
  "default_namespace": "default",
  "teardown_commands": []
}